Improvement in the manufaotube of white lead



H. S. HANNEN.

Manufacture of White Lead. No. 80,168. Patented July 21, 1868 IIWEATWY lWfA Esses. 1 X i y &5

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HENRY s. ,HANNEN, or PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 80,168, dated July 21, 1868.

IMPROVEMENT IN THE MANUFAGTURE'OF WHITE LEAD.

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Be it known that I, HENitY S. HANNEN, of Philadelphia, Pennsylvania, have invented an Improvement in the Manufacture of Carbonate of Lead; and I do herebyidcclare the following to be a full, clear, and exact I description of the same. p a

My invention consists in subjecting metallic lead, while in a close chamber, and after it has been noted on by acetic acid, to the action of carbonic-acid gas, heated" before its introduction iutot-hc chamber, so that'the inconveniences resulting from the use of heatin'g-coils within the chamber are avoided, whilethe gas is brought more intimately in contact with the lead.

My invention further consists in the use of solutions of chloride and carbonate of soda, as described hereafter, forfacilitating the carboriating of the lead, and improving the: quality of the product. V v

In order to enable others skilled in the art to practise my invention, I will. now. proceed to describe the manner of carrying it into effect, reference being bad to the accompanying drawing, which forms a part of this specification, and in which- Figure 1 is a front. elevation of an apparatus which may be used for carrying out my improvements in the manufacture of carbonate of lead, and

Figure 2 is a sectional elevation. a i

A A are the walls,-G is the top, and B the bottom of a case or chamber, at-one side of which is a door, D, equal in height to that of the chamber, and in the said door are openings a, to each of which is fitted a cover, 6, hinged to the door.

The interior of'tho case, as well as the inner sides of the door D andcovers b b, are lined with slate, or are coated with a composition which will not be affected by thematerials introduced into'the chamber, and across the chamber extends a series of perforated plates, .9 s. r

' With the lower part oi. the chamber, at one s ide of-the same, and with the flucof a fireplace, in which coke or coal is burned, communicates a pipe, E, and at the opposite side of the chamber, nearthe top, is an opening, 0, p to which is fitted a valve or damper. p a

Metallic lead, in the form of scraps or flakes, is placed upon the plates 8 s, and is sprinkled with a'liquor, consisting of accticacid and water, in the proportion of one gallon of--acetic acid to every twenty gallons of water, the acid in the liquor combining with the lead, and producing acetate of le'ad.

The chamber is now closed, and carbonic-acid gas, at a temperature of about 130 Fahrenheit, is passed through the tubeE into the chamber, where it combines with the acetate of loud, producing carbonate of lead.

At any time during the above-described operation, a solution of chloride of soda is sprinkled over the lead, and after this the lead is sprinkled-with a solution of carbonate of soda, care being taken to so proportion the quantity of soda, that no excess of the same may remain with the load, to saponi-fy the oil with which the carbonate of load is afterwards ground. I

when the outer surface of the load has become thoroughly carbonated, the lead is again sprinkled with a mixture of water and acetic acid, containing a greater proportion of acid than the'liquor first employed; after which the solutions oi soda are thrown on to-th'c load, as before, the said solutions'aiding inithc carbonating of the lead, and also improving the quality of the product. i

"lhc dill'ercnt liquors thrown on to the lead should not be of a lower temperature than 120 Fahrenheit, and they may be readily deposited on the lcadfrom a pipe terminating in a rose, which is introduc'edinto the chainher through the openings a. v V

Inasmuch as the carbonic-acid gas is hcatodbefore it is introduced into the chamber, and as it passes into the latter near the bottom, it will brought into much more intimate contact with the load than if it were introduced hot into a heated chamber at the top where it would collect, while the use of hcat ing-tubea which render the chamber diflicult to clean, is avoided.

I claim as my invention, and desire to secure by Letters Patent- 1. subjecting metallic lead, after it has been treated i acid gas, introduced near thebottom of the chamber, and is maintained within the chamber without the use of heati 2L subjecting metallic Iehd, during the pro'cess of its tions-o'f chloride of soda. andparbonate of soda, i In testimony whereof. I have signed my nam n a chamber with acetic acid, to the action of carbonicat such a temperature that the proper'degree'of heat rig-apparatus,

conversion into carhonateot' lead, to the action of solusubstantially as and for the purpose-described. e to this specification in the presence of two subscribing witnesses;

, H. S. HANNEN. Witnesses:

CHARLES E. FOSTER, ,W. J. R. YDIELANY. 

